From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Radiator performance test results for a 49-GB car with 10mm and 8mm tubes.
| Identifier | ExFiles\Box 38\2\ Scan093 | |
| Date | 13th May 1920 | |
| R.R. 138a (100 T) S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643. (9-2-20) c 2618 X.3456 13.5.20. X.2631. 49-GB Car. X 3Y2Y X.3456. RADIATOR TESTS. 10 mm Tubes. 3 mile level stretch London Rd. 3/8" stretch Readings. (1) From Derby. To Derby. Water Temp. | atmos. temp. | Foot boards. | M.P.H. | Water Temp. | atmos. Temp. | Foot boards. | M.P.H. 62° | 15° | 24°C | 30 | 62° | 14° | 27° | 30 63 1/2° | " | 25 1/2° | " | 64° | " | " | " 65 1/2° | " | " | " | 65° | " | 26 1/2° | " 67° | " | " | " | 69° | 15° | 27° | " 70° | " | 26° | " | 71° | " | " | " 70 1/2° | " | " | " | 71 1/2° | " | " | " 72° | " | " | " | " | 16° | " | " (2) Ticknall Hill. 10 mm Tubes, 13.5.20. UP. DOWN. 73° | 16° | 26° | 30 | 73° | 14° | 27° | 30 74° | " | 28° | " | 74° | " | " | " 75° | " | " | " | 73° | " | 28° | " 79° | " | " | " | 72 1/2° | " | 28 1/2° | " 78° | 15° | " | " | " | 16° | 29° | " 78° | " | " | " | 8 mm Tubes. 13.5.20. UP. DOWN. 62° | 20° | 26° | 30° | 62° | 17° | 24° | 30 65° | " | 26 1/2° | " | 65° | " | 25° | " 69° | " | 27 1/2° | " | 66 1/2° | " | 25 1/2° | " Contd. | ||